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What is the difference between the R5-A or B and the R5/FCX 3?

April 26, 2017FCX R5 r5-a

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What is the difference between the R5-A or B and the R5/FCX 3?

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Other than having two different connector types The R5-A and the R5-B do the exact same thing- they reset the service reminder lights known as Oil service and Inspection. The R5/FCX 3 is much more capable. It can reset the Si lights, but its main strength is its ability to read and display all engine codes, and reset the “Check Engine” light.